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Etching is the process of transferring an image from a holographic form to a material surface. It is precisely what is done in a dentist's X-ray machine and in the best astronomical photos made by the Hubble Space Telescope. An etching process uses acid to etch the glass in such a way as to leave a shiny metallic surface rather than a dull opaque one. This causes the etching to "whiten," or wash away the images in the holographic form. Etched glass discs had been manufactured for many years. They were used in a multiplicity of applications, particularly for recorders in the field of harmonicas. Berliner's first etching attempts were good, and at one point in his process he made a disc of roughly two and a half inches in diameter that would play music. Unfortunately, he soon found that the earliest goldleaf discs and discs of ordinary photographic film, which were available at the time, did not have the "whiteness" sufficient to be useful.
Berliner carried on experimenting. He first tried to apply his etching process to a photographic emulsion and found that sometimes the emulsion would enable the etching process to work, but most often the image etched would not be strong and unusable. After a time, Berliner picked up the idea of using photographic paper as the etching medium, even though he had never used film as an emulsion. He found that the "whiteness" of the paper was far better suited to the process than did film. Eventually he found that photographic paper is even better at the task than is etching glass, although by the time Berliner began to work with photographic paper, the photographic paper he used to transfer recorded sound to was much thicker, often meaning that the disc became useless for sound recording. At any rate, Berliner found that his discovery of the advantages of the photographic paper process allowed him to develop a new process of using the same process for recording and reproducing sound. His process allowed him to compress the sound and then etch the same disc so as to duplicate it exactly. Never the less, Berliner used a photographic emulsion to record sound. d2c66b5586